The following is the April 29, 2024, Congressional Research Service report, Navy Columbia (SSBN-826) Class Ballistic Missile Submarine Program: Background and Issues for Congress.
From the report
The Navy’s Columbia (SSBN-826) class ballistic missile submarine (SSBN) program is a program to design and build a class of 12 new SSBNs to replace the Navy’s current force of 14 aging Ohio-class SSBNs. Since 2013, the Navy has consistently identified the Columbia-class program as the Navy’s top priority...
https://news.usni.org/2024/05/01/report-to-congress-on-columbia-class-ballistic-missile-sub